Arduino powered with a 12V car battery ?

Other Hardware Motors, Mechanics, Power and CNC
1

Hello, i'd like to kno if it's possible to power an arduino UNO with a car battery (12V). I'd like to create a circuit with a 12v motor, but the arduino's output is about 5v, so I decided to use firstly a transistor, but a chose a relay whereas a transistor. Is it relevant ? Thank you

2

i'd like to kno if it's possible to power an arduino UNO with a car battery (12V). I'd like to create a circuit with a 12v motor, but the arduino's output is about 5v, so I decided to use firstly a transistor, but a chose a relay whereas a transistor. Is it relevant ?

Your scaring me.
The dc jack on the UNO can accept up to +12vdc , That is the maximum dc voltage you can plug into that. The Minimum should be around 9V. (the specs say 7V but 9V adaptors are much more common). I don't know what you mean about the transistor so why don't you just draw a quick schematic and take a photo of it with your cell phone and post it so we can make sure you're thinking of doing anything stupid.

3

https://gm1.ggpht.com/17qoYWuzS6dtIYgQPn5b33w3CuoISorR-FhCbstMUH0FqJ_nAyTDy6t1utZOiEjUoPpYxfEnjbkkjCblwXiYYtTkYu0qtKYHegR8UHSAz2U4cFtY7m0QnMG-D8ISAWe-apeyBdoEP1ZVZtYK-UVNDcC4AWh9Nx1cYaIGypysTzP5etT4YZKB8s_1Loo7F3uplNiJg0riuk37VijIGZUaAalTzu41eN_-qm1vnRsA9CSg0Bts4oTXGkNwfOnI8_XAOP0BPERroBdsBvsVmgvaX6MI9MoDWIiqlJUyBIKX37dO2IO9miVHvcZJRjwkk0uSctKgVOUmtYbyklzTCD1--g51IMYIesLWlBK1nP3skLQ0vxF9YD_C4LSACEwnXoHLNiXlxOxkeq-PgJz9EDQS5hVHh1IhJJJSImzPX-rLpzxgs4I8zT89RX67HP9vvGrSiPTTLVWP-3w3UrSaI-hWmufhBTc_4YfKTgxty5L7cwBnMVB5hEGk0JYXhvcXXByK0aillxxfCazuxxIecduYkjfFjPlvBNvPSA=w1328-h652-l75 Here is the schematic. The motor needs a 12V alimentation, so I can't just plug it directly with the arduino

4

I can't access that link. Why not upload the drawing to this Forum to save us having to go somewhere else?

Remember that 12v car batteries can have voltages well above 12 and even above 13. Mine go to 14.7 - 14.9 while being charged.

If you mean that you want the Arduino to control something else that uses 12v then, yes, a transistor or relay can be used to allow the 5v system to control the 12v system. The Arduino probably can't supply enough current to drive a relay directly so you would also need a transistor between the Arduino and the relay coil.

...R

5

Here it is

IMG_20140405_214745.jpg
IMG_20140405_214745.jpg2448×3264 2.27 MB

6

I can't make sense of your diagram (also, please reduce images to 640x480 so we can view them easier).

You have a single cell battery in the image, or is that meant to be the 12v battery?

You have a rectangle with 2 + connections and 2 - connections - what is it?

You seem to have the motor permanently connected to the battery and you seem to have a transistor that will short-circuit the battery.

I don't see any sign of an Arduino.

But it wouldn't surprise me to find I am wrong.

...R